Vaned diffuser design method and vaned diffuser

The invention provides a design method of a vaned diffuser and the vaned diffuser, and relates to the technical field of compressors. The bladed diffuser comprises a diffuser body and a blade arranged on the diffuser body, the blade is provided with a front face and a back face, the blade is provided with a jet flow channel penetrating from the front face to the back face, and the jet flow channel is provided with a throat opening exposed out of the back face. The design method of the bladed diffuser comprises the steps that a diffuser body and blades are obtained; acquiring an initial position of flow separation of the fluid on the back surface; and determining the throat position of the jet channel according to the initial position. Due to the pressure difference effect of the front faces and the back faces of the blades, part of fluid flowing along the front faces of the blades flows into the jet flow channels in an accelerated mode and flows to the back faces of the blades along the jet flow channels, the